Last night i had a strange but very vivid dream.

I dreamt i was on a boat in the sea with a group of people, one being an ex boyfriend who i haven't thought of for a couple of years.
We were in charge of holding some ropes and we were chatting away about his current girlfriend when my rope got caught under the boat.
I jumped in to untangle it, knowing that i am terrified of the sea, and almost drowned. i started splashing about to get someone's attention for them to jump in and help me but no one did.
Everything went all peaceful after that and i remember reaching up to a rope - the rope that got tangled. I then surfaced and got back on the boat.

When i went up to my ex i asked him why he didn't save me when i thought i was drowning... and he replied with "sometimes you have to learn how to save yourself"

Is there any meaning behind this? Is this a sign about something?
And was there any significance on him being in my dream?

i cannot stop thinking about it...any help would be greatly appreciated!!